package utils;

import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
import android.os.Build;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.Window;
import android.view.WindowManager;

import java.lang.reflect.Method;

/**
 * Created by admin on 2017/5/26.
 */

public class DensityUtil {
    /**
     * 根据手机的分辨率从 dp 的单位 转成为 px(像素)
     */
    public static int dip2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }

    /**
     * 根据手机的分辨率从 px(像素) 的单位 转成为 dp
     */
    public static int px2dip(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }


    /**
     * 检查是否存在虚拟按键栏
     *
     * @param context
     * @return
     */
    public static boolean hasNavBar(Context context) {
        Resources res = context.getResources();
        int resourceId = res.getIdentifier("config_showNavigationBar", "bool", "android");
        if (resourceId != 0) {
            boolean hasNav = res.getBoolean(resourceId);
            // check override flag
            String sNavBarOverride = getNavBarOverride();
            if ("1".equals(sNavBarOverride)) {
                hasNav = false;
            } else if ("0".equals(sNavBarOverride)) {
                hasNav = true;
            }
            return hasNav;
        } else { // fallback
            return !ViewConfiguration.get(context).hasPermanentMenuKey();
        }
    }

    /**
     * 判断虚拟按键栏是否重写
     *
     * @return
     */
    private static String getNavBarOverride() {
        String sNavBarOverride = null;
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            try {
                Class c = Class.forName("android.os.SystemProperties");
                Method m = c.getDeclaredMethod("get", String.class);
                m.setAccessible(true);
                sNavBarOverride = (String) m.invoke(null, "qemu.hw.mainkeys");
            } catch (Throwable e) {
            }
        }
        return sNavBarOverride;
    }


    //获取屏幕原始尺寸高度，包括虚拟功能键高度
    public static int getDpi(Context context) {
        int dpi = 0;
        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        Display display = windowManager.getDefaultDisplay();
        DisplayMetrics displayMetrics = new DisplayMetrics();
        @SuppressWarnings("rawtypes")
        Class c;
        try {
            c = Class.forName("android.view.Display");
            @SuppressWarnings("unchecked")
            Method method = c.getMethod("getRealMetrics", DisplayMetrics.class);
            method.invoke(display, displayMetrics);
            dpi = displayMetrics.heightPixels;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return dpi;
    }

    /**
     * 获取 虚拟按键的高度
     *
     * @param context
     * @return
     */
    public static int getBottomStatusHeight(Context context) {
        int totalHeight = getDpi(context);

        int contentHeight = getScreenHeight(context);

        return totalHeight - contentHeight;
    }

    /**
     * 标题栏高度
     *
     * @return
     */
    public static int getTitleHeight(Activity activity) {
        return activity.getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();
    }

    /**
     * 获得状态栏的高度
     *
     * @param context
     * @return
     */
    public static int getStatusHeight(Context context) {

        int statusHeight = -1;
        try {
            Class<?> clazz = Class.forName("com.android.internal.R$dimen");
            Object object = clazz.newInstance();
            int height = Integer.parseInt(clazz.getField("status_bar_height")
                    .get(object).toString());
            statusHeight = context.getResources().getDimensionPixelSize(height);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return statusHeight;
    }


    /**
     * 获得屏幕高度
     *
     * @param context
     * @return
     */
    public static int getScreenHeight(Context context) {
        WindowManager wm = (WindowManager) context
                .getSystemService(Context.WINDOW_SERVICE);
        DisplayMetrics outMetrics = new DisplayMetrics();
        wm.getDefaultDisplay().getMetrics(outMetrics);
        return outMetrics.heightPixels;
    }

    public static void setHideVirtualKey(Window window) {
        hideBottomUIMenu(window);
        //保持布局状态
//        int uiOptions = View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
//                //布局位于状态栏下方
//                View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
//                //全屏
//                View.SYSTEM_UI_FLAG_FULLSCREEN |
//                //隐藏导航栏
//                View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
//                View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
//        if (Build.VERSION.SDK_INT >= 19) {
//            uiOptions |= 0x00001000;
//        } else {
//            uiOptions |= View.SYSTEM_UI_FLAG_LOW_PROFILE;
//        }
//        window.getDecorView().setSystemUiVisibility(uiOptions);
    }
    /**
     * 隐藏虚拟按键，并且全屏
     */
    protected static void hideBottomUIMenu(Window window) {
        //隐藏虚拟按键，并且全屏
        if (Build.VERSION.SDK_INT > 11 && Build.VERSION.SDK_INT < 19) { // lower api
            View v = window.getDecorView();
            v.setSystemUiVisibility(View.GONE);
        } else if (Build.VERSION.SDK_INT >= 19) {
            //for new api versions.
            View decorView = window.getDecorView();
            int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                    | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY | View.SYSTEM_UI_FLAG_FULLSCREEN;
            decorView.setSystemUiVisibility(uiOptions);
        }
    }

    //获取物理尺寸
    public static double getScreenInches(Activity activity){
        DisplayMetrics dm = new DisplayMetrics();
        activity.getWindowManager().getDefaultDisplay().getMetrics(dm);
        double x = Math.pow(dm.widthPixels/dm.xdpi,2);
        double y = Math.pow(dm.heightPixels/dm.ydpi,2);
        double screenInches = Math.sqrt(x+y);
        return screenInches;
//        Log.d("debug","Screen inches : " + screenInches);
    }





}
